Concentrations and activity ratios of uranium isotopes in the groundwater of the Okchun Belt in Korea

Distribution of uranium isotopes in surface water of the Llobregat river basin (Northeast Spain)

“…3 shows 234 U/ 238 U activity ratio as a function of uranium concentration. The waters with the lowest uranium activity registered the highest level of 234 U/ 238 U activity ratio (Lee et al, 2001) so an inverse behavior was found between uranium concentration and 234 U/ 238 U activity ratio. Table 3 shows the statistical parameters for some chemicals (conductivity, carbonate and chloride) and physical (flow rate) characteristics for the studied rivers at the Llobregat watershed.…”

Distribution of uranium in German bottled and tap water

“…Relatively high uranium concentrations have been found in black shales (up to 250 mg/kg; Lee et al, 2001).…”

Hydrogeochemical features of surface water and groundwater contaminated with acid mine drainage (AMD) in coal mining areas: a case study in southern Brazil

“…For example, vegetation has been removed from the site, relief has undergone drastic changes, and the groundwater table is now at the terrain surface. Modification on the chemical composition of surface waters and bottom sediments has been also verified, for instance, pH lowering and increase of Al 3+ , Ca 2+ , Sr 2+ , Mn 2+ , Na + , SO 4 2− , and Cd (total) concentrations close to the coal mine relatively to other areas in Paraná State (Licht 2001).…”

“…The rainwater infiltration into the reject dump promotes metal leaching and the water contamination. Simultaneously, dilution of metals and compounds occurs, as rainwater increases the water volume into the stream, improving the water quality (Lee et al 2001). Caraballo et al (2016) proposed three hydrochemical stages for AMD in a sulfide mining district: a high metal concentration with a low flow rate; an extreme metal concentration with a high flow rate; a mixed situation comprising a high flow rate, and medium high metal concentration.…”